R has some really excellent builtin numerical and statistical routines that are exposed via a C API: https://colinfay.me/r-installation-administration/the-stand

R has some really excellent builtin numerical and statistical routines that are exposed via a C API: https://colinfay.me/r-installation-administration/the-standalone-rmath-library.html https://colinfay.me/r-installation-administration/the-standa...